Common Periwinkle - Littorina littorea

A common winkle along the Maine coast. It had a blunt spire, pale columella, and was about 20-25 mm long. Periwinkles are vegetarians and can withstand long periods of time without food or water.

This one was underwater in this photo and had a lot of its body outside of its shell. I don't know what it was doing, but it was moving around and seemed fine.

Habitat: Low tide zone